Hi all -
I seek your collective sage advice.
As part of my mid-life 'crisis' I decided to get into the money pit that is astronomy. After much research etc. I bought a Celestron 9.25 EdgeHD SCT with a Baader SCT 2" clicklock back on an Skywatcher AZEQ6-GT mount.
I also bought a ZWO ASI224MC colour camera and want to do planetary imaging. As per
Celestron's EdgeHD white paper I have setup an extension tube train to make up the required 146mm back focus (taking into account the Baader ClickLock back) for prime focus imaging.
I also want to use my 2" Televue Powermate 2x for which I also have the T-ring adapter. My question is what amount of back focus do I need from the Powermate T-ring adapter? From reading the Televue website and a very brief chat to Al Nagler himself from TeleVue in New York I understand this to be 2" (56mm) to the imager. Is this correct or do I need to still work the powermate in with the 146mm stated by Celestron?
Thanks in advance and clear skies!